メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4312500 31.4166667, 130.4375000 31.4166667, 130.4375000 31.4208334, 130.4312500 31.4208334, 130.4312500 31.4166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral